Testing Grass Control Herbicides on Corn
September 25, 2012
With an investment of $22,800 under the Farm Innovation Program (FIP), Grain Farmers of Ontario undertook a study to determine the risk associated with replanting corn after the application of graminicides. Graminicides are a group of herbicides used in soybeans to control emerged volunteer corn and annual grassy weeds.
Five graminicide treatments were evaluated, including Assure II + Sure Mix, Excel Super, Poast Ultra + Merge, Select + Amigo, and Venture L. No injury or yield loss resulted when graminicides were applied one day before planting corn or three days before corn emergence. When graminicides were applied as corn seedlings were emerging, injury resulted. Injury was temporary when corn seedlings were emerging and no reduction in final corn populations or grain yield was detected. The results indicated that graminicides can be safely applied to control established corn up to three days prior to emergence of the newly planted corn crop. This knowledge will enable Ontario corn producers to make informed crop management decisions in the event of a poor corn crop stand.
This project was funded in part through Growing Forward, a federal-provincial-territorial initiative. The Agricultural Adaptation Council assists in the delivery of several Growing Forward programs in Ontario.